8.E.1.3 Water Quality

Which would MOST LIKELY result in an unhealthy aquatic habitat?

• a decrease in turbidity

• a decrease in nitrates levels

• an increase in water temperature

• an increase in dissolved oxygen levels

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Pure water is neutral. If water is neither an acid nor a base, what is the pH of water?

• 0

• 7

• 10

Which best describes the relationship between temperature and dissolved oxygen in a lake?

• As temperature increases, dissolved oxygen increases.

• As temperature increases, dissolved oxygen decreases.

• As temperature decreases, dissolved oxygen decreases.

• A change in temperature has no effect on dissolved oxygen.

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If a large amount of fertilizer enters a lake, which will most likelyhappen?

• The fish population in the lake will increase.

• The temperature of the lake water will increase.

• The number of fish dying in the lake will increase.

• he available food supply for the fish in the lake will increase.

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Which best explains why a scientist would use nets to capture and count organisms in a river?

• to measure pH

• to measure turbidity

• to measure biodiversity

• to measure temperature

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What does pH measure?

• acidity/alkalinity

• dissolved oxygen

• nutrient level

• turbidity

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Which would be the most likely cause of large numbers of fish dying in a stream?

• a lack of nitrogen

• high levels of mercury

• decreased carbon dioxide

• low dissolved oxygen concentration

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Which organism would make a good bioindicator?

• an organism that is endangered

• an organism that is tolerant of slight physical or chemical changes

• an organism that has reached its carrying capacity in the ecosystem

• an organism that is not sensitive to slight physical or chemical changes

Which is the greatest impact of large quantities of sediment flowing into North Carolina’s rivers and streams?

• Sediment poisons fish.

• Sediment prevents light from reaching plants.

• Sediment interferes with the ability for fish to find mates.

• Sediment increases the depth of rivers and streams, reducing the amount of flowing water.

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Turbidity measurements were taken at different distances from the shore of a lake.

Which best explains why the turbidity increases as water samples are taken closer to the shore?

• Shoreline erosion causes sediment to wash into the lake.

• Sediment is carried from the middle of the lake to the shore by wind.

• Swimmers stir up sediment by splashing in the water near the shore.

• Fish stir up sediment while feeding on plants that grow close to the shore.

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